1-are you asking transfer file before installing OS or after ,after os installation you have a lot of options ,usb cable/ethernet connection/ over lan if you have router etc.
2-Yes you can partition hdd like you can do at desktop .Use win7 dvd if you have ,older xp cds had problem with hdds with over 127gb until sp2 ,if youll use xp cd use sp2 or sp3 integreted xp cd just to be safe
3-Yes of course it is possible , install xp first and win7 later .Microsoft OSs has this order older OS first ---> new OS later

A laptop without a OS can be had from some companies(new, used, refurbed, etc.) or purchased second hand, or by other means(gift, given - because thought dead, etc.).
Just 'cause it has DOS on it, doesn't necessarily mean old.

If he wants to use XP then he may need to use nLite to slipstream AHCI drivers to his XP install. His laptop is new enough that the XP disc might not recognize his HD.

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installed win7 ...xp is not possible in this laptop ...I am worried now...why xp is not getting installed in my laptop?
I have 640gb WD aaks in my desktop...have plans to sell it..... what my doubt is in future will win xp be compatible with new desktop hard drives ? please advice ...If it is a 'no' then I will keep this WD 640gb aaks..so please advice asap

Ya you have to enable AHCI support in bios because the XP boot cd can't see your HDD because it lacks the drivers. But knowing dell and what cheapskates they are, you probably won't be able to find any XP drivers for your hardware anyway...

^^^ nice so u got discount ...I didn't ask them...
yes the laptop is good will post pics soon...but bluedart guys wont update details properly ... It is not good for playing games @ max settings..tried motogp 08 .with all settings high ,,w/o motion blur and particle effect...have to check crysis..I hope it will run crysis in medium ~low settings ...

^^^ nice so u got discount ...I didn't ask them...
yes the laptop is good will post pics soon...but bluedart guys wont update details properly ... It is not good for playing games @ max settings..tried motogp 08 .with all settings high ,,w/o motion blur and particle effect...have to check crysis..I hope it will run crysis in medium ~low settings ...

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Hi Subhendu,

Thanks for your feedback. Looking forward to see the pics

Mine is still in factory, as per status. So waiting

Sorry, again asking ... how much it costed you ? I got some discount,
but just want to see if there is any difference in pricing.